Specification:Name: Timing Pulley Synchronous WheelMain Material: Aluminum alloyModel: XLType: BF or K TypeTooth Shape: Trapezoidal TeethTeeth Pitch: 5.08mmTeeth Number: 16 TeethBore: 5mm 6mm 6.35mm 7mm 8mm 10mm 12mm 12.7mm 14mm 15mm 16mm 17mm (Through Hole); 8l3x1.4mm 10l4x1.8mm (Keyway Hole)Slot width: 11mm (suitable for timing belt width 10mm)Application:Suitable for transmission componentsNote:1.Different batches, slightly varied appearance.2.Synchronous wheel materials is aluminum alloy, conserving edge iron galvanized, the skin isn't always treated, there could be a little oxidation phenomenon.3.Except for the Bore(D), the external dimensions (such as Total height, set screw, max width, steps, etc.) might range slightly due to varied batches.4.The data is for reference only, the particular product shall prevail.Package:Packing : Plastic bag / Carton box.Quantity : According for your Choose!